No, one day Iíll learn that concept, it looks like itís really useful.
I think I have the same (perhaps faulty) thought process as universal, when he says:
This situation refers to your frame 1 but without the test charge moving. ďIfĒ thereís a Lorentz boost as seen from the test charge, it should feel an extra electrostatic force.
My take on it is (and the reality is) that no such extra electrostatic force is present therefore this whole idea of a magnetic field being a Lorentz boosted electrostatic field is for a lot of us hard to believe.